I’d also take my own regs. I use a streamlined setup with necklace reg. Switching to rental junk is too much of a change for me to be comfortable. And too many rentals have beat up leaky hoses.
I bring all my own gear. Just need 8# of lead from the dive op if it’s drifty. 16# backplate and fins go in my luggage. Everything else goes in my carry on.
My knife is a steak knife with the tip cut off. Nobody, even RC’s scanners, has said anything about it. I might replace it with a DGX line cutter soon.